Add named loggers to rospy by ggallagher01 · Pull Request #948 · ros/ros_comm

ggallagher01 · 2016-12-12T15:34:18Z

This change will create (named) child loggers under rospy.rosout. This allows for each named logger to have seperate verbosity setting, this will allow for two different verboisty settings for logging in a single node. Two named loggers can log to rosout at two different verbosity setings, which can help noisy debug logs.

dirk-thomas

Currently the patch fails to run the tests. Please iterate on this and run the tests locally.

dirk-thomas · 2016-12-12T17:50:49Z

clients/rospy/src/rospy/core.py

    """Internal rospy client library warn logging"""
    _rospy_logger.warn(msg, *args)
-
-logdebug = logging.getLogger('rosout').debug


These variables are public API and can't be changed without breaking compatibility.

I think this is replaced in line 181 of the new file:

https://github.com/ros/ros_comm/pull/948/files#diff-84739190beb4f06aecd26a816f126e29R181

I'll take a look at it, I included a bunch of different commit here by accident. I'm cleaning up now

dirk-thomas · 2016-12-12T17:51:07Z

clients/rospy/src/rospy/core.py

    """
    if uri.startswith(ROSRPC):
-        dest_addr = uri[len(ROSRPC):]            
+        dest_addr = uri[len(ROSRPC):]


Please avoid any unrelated white space changes in your PR (even if the current file might be "ugly"). It makes backporting changes across branches much more difficult.

Please take a look at the diff on the GitHub PR and update the PR to avoid any unnecessary changes.

sorry I thought I got them, I'll fix it up

I'll fix this again, I think the file has mixed line endings and my editor is trying to be helpful

dirk-thomas · 2017-01-17T18:53:08Z

My previous comment still applies to the updated change. Please avoid any unrelated white space changes in your PR.

dirk-thomas

Can you please add some unit tests (https://github.com/ros/ros_comm/blob/kinetic-devel/test/test_rospy/test/unit/test_rospy_core.py) covering the new funtionality.

dirk-thomas · 2017-01-26T23:09:31Z

clients/rospy/src/rospy/core.py

+def _get_digest(*args):
+    m = hashlib.md5()
+    for arg in args:
+        m.update(str(args))


Should this call update with arg instead of args?

yes, it should be arg instead of args. I'll fix that up.

Using MD5 for this seems like overkill. What about something like hash(tuple(*args + [str(msg)]))?

(Python's hashdoesn't do the right thing, so you can't use it directly, see ros/genpy#73)

That should work, we only want to know the content of the print has changed. I'll test it out tonight.

dirk-thomas · 2017-01-26T23:19:54Z

clients/rospy/src/rospy/core.py

+    logfunc = getattr(rospy_logger, level)
+
+    if throttle:
+        caller_id = _frame_record_to_caller_id(inspect.stack()[1])


Is 1 still correct now that the function is one level more nested?

I believe 2 is correct now because of the one more level down, I'll verify and fix that up

ggallagher01 · 2017-02-09T15:28:20Z

I resolved all the white space conflicts that my editor injected. Is there a standard line ending that each file should follow? I see this core.py has mixed line endings. I should have unit tests up tomorrow, I have a test program that I used for develpoment I'll port to the test framework.

mikepurvis · 2017-02-16T18:27:43Z

clients/rospy/src/rospy/core.py

+    try:
+        level = kwargs.pop('logger_level')
+    except KeyError:
+        level = None


For my curiosity, what does this achieve over, eg:

def _base_logger(msg, name=None, throttle=None, level=None, *args, **kwargs): rospy_logger = logging.getLogger('rosout') if name: rospy_logger = rospy_logger.getChild(name) logfunc = getattr(rospy_logger, level) if throttle: caller_id = _frame_record_to_caller_id(inspect.stack()[2]) _logging_throttle(caller_id, logfunc, throttle, msg, *args) else: logfunc(msg, *args)

I had the function using default values in one iteration but I believe i started failing tests and decided to use the keyword arguments instead. I'll rerun the tests and see if I can remember why I switched to using keyword args instead.

Looking back through my testing, I had a test case where using the named arguments for name, throttle and level (like above) would interfer with variable length arguments. This happened when testing out code that was using the existing public API, the named variables would end up taking some of the values from the multi length arguments.

Oh of course, that makes sense. In that case, maybe pass the default to pop rather than catching the exception. Eg:

def _base_logger(msg, *args, **kwargs): name = kwargs.pop('logger_name', None) throttle = kwargs.pop('logger_throttle', None) level = kwargs.pop('logger_level', None)

much cleaner, will change that

ggallagher01 · 2017-04-25T16:19:08Z

I believe all the the comments have been resolved, please let me know if there is anything else needed

ggallagher01 · 2017-05-10T02:13:52Z

cleaned up the review, looks better now. Tests are passing on my local machine.

ggallagher01 · 2017-05-10T15:51:10Z

Looks good now, white space should be fixed to only what I changed and tests are now passing.

ggallagher01 · 2017-05-29T18:55:59Z

ping @ros/ros_comm-maintainers

All comments I believe are resolved

DLu · 2017-07-07T14:29:15Z

👍

dirk-thomas · 2017-07-10T18:50:44Z

Sorry for the late response. This looks almost ready. Recently some concerns regarding performance came up though which have been addressed in #1091 for the other logging function. Can you please update the PR to use a similar approach. Thank you.

This will also need to be rebased.

…gers under rospy.rosout. This allows for each named logger to have seperate verbosity setting, this will allow for two different verboisty settings for logging in a single node. Two named loggers can log to rosout at two different verbosity setings, which can help noisy debug logs.

dirk-thomas · 2017-07-18T16:50:44Z

Thank you for this new feature. Please consider adding some information to the wiki page to mention this to be available as of Lunar and post the link here for future readers.

kartikmohta · 2017-08-04T01:44:15Z

This breaks the Location of the message shown in rqt_console. Now the location of the message is always shown to be core.py:_base_logger:163 instead of the user code location.

dirk-thomas · 2017-08-11T22:46:48Z

This breaks the Location of the message shown in rqt_console. Now the location of the message is always shown to be core.py:_base_logger:163 instead of the user code location.

@ggallagher01 Can you please look into this.

mikepurvis · 2017-08-11T23:40:14Z

I think the issue here is that we jump up two stack frames in the throttle case, but in the other case we need to jump up one frame (currently nothing):

    if throttle:
         caller_id = _frame_to_caller_id(inspect.currentframe().f_back.f_back)
         _logging_throttle(caller_id, logfunc, throttle, msg, *args)
     else:
         logfunc(msg, *args)

I can verify this and throw up a PR for it.

mikepurvis · 2017-08-14T02:37:40Z

Okay, I did dig into this a little more, and it's not quite as simple— the code I pasted only has to do with identifying the caller for the purposes of enforcing throttling. The actual logic which identifies the caller was added only recently in #1043, see:

https://github.com/ros/ros_comm/blob/lunar-devel/tools/rosgraph/src/rosgraph/roslogging.py#L52-L80

It looks like this is a case where the underlying logic built into logging is basically doing the right thing as far as identifying call site, but since that API has been wrapped, it's now pointing at the wrapper rather than user code. AFAICT, there are a couple ways this could be handled:

Since the amount of wrapping is not always consistent:

Put a blacklist in findCaller (eg, if you see rospy/core.py, keep going, or if you see base_logger, keep going, etc).
In the partial and other pass-thru calls, curry in a number for how many steps out to take.

See some discussion here as well: https://stackoverflow.com/questions/19615876/showing-the-right-funcname-when-wrapping-logger-functionality-in-a-custom-class

mikepurvis · 2017-08-14T03:10:48Z

Okay, I've opened #1141 with a potential fix, so we can discuss that and other options there.

gavanderhoorn · 2017-11-08T10:29:20Z

This is a great addition, but wiki/rospy/Overview/Logging does not mention it. Is that an oversight? @ggallagher01: would you be willing to add that?

From rospy equivalent of ROS_*_NAMED on ROS Answes.

ggallagher31 · 2017-11-09T15:05:08Z

I'll have some time this weekend to add this

yli-cpr · 2018-09-20T21:04:17Z

I found that http://wiki.ros.org/rospy/Overview/Logging doesn't contain the features this commit adds. It may need to be updated.

Another confusing thing is that on the wiki page, rospy.log*() methods don't take kwargs. But it seems before this change, they did accept kwargs.

I am actually looking at the support of exc_info, one of the 2 kwargs that python Logger supports (the other is extra). See https://docs.python.org/2/library/logging.html.

This ticket probably broke the python logger's kwargs like exc_info, because it doesn't forward kwargs to the logger. Should rospy logging support exc_info and extra?

mgrrx · 2018-09-21T20:30:00Z

@yli-cpr checkout #1289 for the support of kwargs.

dirk-thomas · 2018-09-21T23:50:25Z

I'll have some time this weekend to add this

I found that http://wiki.ros.org/rospy/Overview/Logging doesn't contain the features this commit adds. It may need to be updated.

@ggallagher31 Can you please follow up on this and add documentation about this feature to the wiki page.

timonegk · 2019-05-14T21:38:05Z

Ping. This feature is still not documented in the ROS wiki. I would be willing to provide the documentation but the wiki site is immutable for me.

gavanderhoorn · 2019-05-15T07:19:22Z

@timonegk: the wiki is read-only, unless you have an account.

You can register for an account here. After that, you'd have to request write-access (spam protection measure) in ros-infrastructure/roswiki#258.

timonegk · 2019-05-15T09:57:03Z

@gavanderhoorn Thank you. I was not aware of the whitelist.

gavanderhoorn · 2019-05-15T09:58:22Z

I believe it's mentioned after you register.

timonegk · 2019-05-21T18:00:41Z

This feature is now documented (http://wiki.ros.org/rospy/Overview/Logging#Named_Logging).

dirk-thomas reviewed Dec 12, 2016

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dirk-thomas merged commit 309de11 into ros:lunar-devel Jul 18, 2017

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mikepurvis mentioned this pull request Aug 14, 2017

Fix stack frame identification in rospy logging. #1141

Merged

dirk-thomas mentioned this pull request Oct 26, 2017

changes between 1.12.7 and 1.13.4 for backporting #1205

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